Machine level programs-microprocessor, Assembly Language

Machine Level Programs

In this section, a few machine levels programming instance, rather then, instruction sequences are presented for comparing the 8086 programming with that of 8085. These programs are ii the form of instruction sequences as 8085 programs. These can even be hand-coded entered byte by byte and executed on an 8086 based system but due to the complicated instruction set of 8086 and its tedious opcode conversion procedure, mostly programmers prefer to use assemblers. However, we will deeply discuss the hand- coding,

Example :

Write a program to add data byte situated at offset 0500H in 2000H segment to another data byte available at 0600H in the similar segment and the result is store at 0700H in the similar segment.

Solution :

The flow chart for this problem might be drawn as given figure

2421_sol 1.jpg

1951_sol 2.jpg

The above instruction is quite straight-forward. As the immediate data can't be loaded into a segment register, the data is transferred to one general purpose resistors AX. And then the register general purpose registers AX, and then the register content is moved to the segment registers DS. Thus the data segment register DS have 2000H. The instruction MOV AX,[500H] signifies that  the contents of the specific location, whose offset is indicated in the brackets having the  segment pointed to by DS segment register, is to be moved to register AX. The MOV [0700], AX instruction moves the contents of the AX to an offset 0700H in DS (DS  =  2000H). Make a point that the code segment register CS gets automatically loaded by the code segment address of the program whenever it is executed. In actual it is the monitor program that accepts the CS:IP address of the program and passes it to the equivalent registers on the time of execution. Hence no instructions are needed for loading the CS register like SS or DS.

 

Posted Date: 10/12/2012 6:25:09 AM | Location : United States







Related Discussions:- Machine level programs-microprocessor, Assignment Help, Ask Question on Machine level programs-microprocessor, Get Answer, Expert's Help, Machine level programs-microprocessor Discussions

Write discussion on Machine level programs-microprocessor
Your posts are moderated
Related Questions
1) Write an 80x86 assembly language program in EXE file format to do the following tasks: a) Open and read the contents of a file into memory (use at least 1 kB). b) Sort the li

segmentation and overlapping in assemble language

Perform an extensive web search of popular microcontroller manufacturers (some of the major players) to select a suitable device for the system to control the lighting of a typical

Computes the integral square root: Problem: Square Root:   For this problem you will write a short assembly program that computes the integral square root of an input numb

A good starting point for your program is the toupper.asm program shown in class. It already queries the user for input and sets up a loop that looks at each character of the input

The definitions of the bits in ICWI are following: Always set to the value 1. It directs the received byte to ICWI as oppose to OCW2 or OCW3. Which also utilize the even addr

Pointer and Index Registers The pointers contain offset within the specific segments. The pointers BP, IP and SP generally containoffsets within thedata, code and stack segment

The Pentium   The next member of the Intel family of microprocessors was the Pentium, introduced in the year 1993. With the Pentium, Intel broke its custom of numeric model name

MOVSW/MOVSB : Move String Word or String Byte: Imagine a string of bytes, stored in a set  of consecutive memory locations is to be moved to another set of  the destination locati

SCAS : Scan String Byte or String Word:- This instruction scans a string of words or byte for an operand word or byte specified in the register AL or  register AX. The string i